The only incompatibility with 7401 is the small lockring cog. Other than that, any UG or modified HG cog will fit just fine. While rare, they are out there. And the smallest cog does not typically see much wear.

However, the freehub itself, including the tool to remove it, is totally unique and if it goes bad, you're pretty much up the creek in a chickenwire canoe. So to speak.